2.The Auk: Quarterly Journal of Ornithology by American Ornithologists' Union, Nuttall Ornithological Club (1920)"... but in the South American Tyrannidae or Formicariidae we find just as much
divergence in external characters among species which we feel sure must be ..."

3.Text-book of Paleontology by Karl Alfred von Zittel (1902)"... and their relatives: also the ant thrushes (Formicariidae), and their relatives.
The order dates from the Eocene, ..."